var xmlHttp2;

function hide_markers(gid)
{ 
xmlHttp2=GetXmlHttpObject();
if (xmlHttp2==null)
 {
 alert ("Browser does not support HTTP Request");
 return
 }
var url="ajx_hide_markers.php";
url=url+"?gid="+gid;
url=url+"&sid="+Math.random();
xmlHttp2.onreadystatechange=stateChanged2 ;
xmlHttp2.open("GET",url,true);
xmlHttp2.send(null);
}

function stateChanged2() 
{ 
if (xmlHttp2.readyState==4 || xmlHttp2.readyState=="complete")
 {
 	var str = xmlHttp2.responseText;
//	alert(str);
	var mid = str.split(":");
	for(var i=0;i < mid.length;i++)
	{
		gmarkers[mid[i]].hide();
	}
 } 
}

//general func

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}